Reaction Times During Interrupt Processing - Siemens SIMATIC S5 IP 281 Equipment Manual

Interrupt Processing
4.3

Reaction Times During Interrupt Processing

The reaction time to an interrupt consists of the following partial times.
– Acquisition time of the module
– Acquisition time in the programmable controller
– Processing time of the interrupt program
Acquisition time (An enabled interrupt source)
The time between the triggering event and the triggering of the interrupt line
of the module
is a maximum of2 ~sec. When the event is triggered by external signals, the
delay time required to set the input filter must also be added (+ section 8.7).
Acquisition time Interrupt acquisition in the PLC depends on the programmable controller
in the program- and the central processing unit used. Processing times of the system
mable controller program can be found in the applicable equipment manuals.
Interrupt at The longest reaction time to an interrupt is usually the processing time
between two synchronization points.
synchronization
points
Interrupt at The longest reaction time to an interrupt is usually the processing time in the
instruction operating system or the processing time of special functions or integrated
function blocks.
boundaries
Interrupt at The longest reaction time of an interrupt is usually the processing time of the
longest running part of the program without block calls or block end
block boundaries
instructions.
Interrupt Always remember that no interrupts are processed during a programmed
interrupt disable. The processing time of a program section containing an
disable
interrupt disable may have to be included when determining the reaction
time to an interrupt.
The processing time is primarily determined by your own programming,
Processing time
of the interrupt
program
4 – 4
time significantly.
R 11192